Span<T> benchmarks

Benchmarks.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Attributes.Jobs;
using BenchmarkDotNet.Running;
using System;
using System.ComponentModel;

namespace PropertyCache
{
    [ClrJob, MonoJob, CoreJob]
    [MemoryDiagnoser]
    public class Benchmarks
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<Benchmarks>();
        }

        [GlobalSetup]
        public void Setup()
        {
            var bytes = new byte[100];
            new Random(42).NextBytes(bytes);
            stringNumbers = string.Join(";", Array.ConvertAll(bytes, Convert.ToInt32));
        }

        public static string stringNumbers = string.Empty;
        public static string contentLength = "content-length:534";

        [Benchmark]
        public static int SumStringNumbers()
        {
            int sum = 0;
            var numbers = stringNumbers.Split(";");
            foreach (var num in numbers)
            {
                sum += int.Parse(num);
            }

            return sum;
        }

        [Benchmark]
        public static int SumStringNumbersWithSpan()
        {
            int sum = 0;
            ReadOnlySpan<char> span = stringNumbers;
            while (true)
            {
                int index = span.IndexOf(';');
                if (index == -1)
                {
                    sum += int.Parse(span);
                    break;
                }
                sum += int.Parse(span.Slice(0, index));
                span = span.Slice(index + 1); 
            }
            return sum;

        }

        [Benchmark]
        public static int ParseContentLength() => Int32.Parse(contentLength.Substring(15));
        
        [Benchmark]
        public static int ParseContentLengthWithSpan() => Int32.Parse(contentLength.AsSpan().Slice(15));

    }

}